Vcore Xi98 and Vcore Tour 97 (310)

Could you compare/contrast the Vcore Xi98 and the Vcore Tour 97 please? I know there are the TW reviews on website for both of these racquets, but I am wondering if there is any noticeable difference between these two racquets in terms of power, stiffness, feel, and control.

One more question: I see on the TW website that the Vcore Tour 97 (310) has only three grip size available (3/8, 1/2, and 5/8), and I am wondering whether other grip sizes such as 1/8 and 1/4 will be in stock soon.